Building for the Mackay Climate: The Importance of Energy-Efficient Design

Mackay’s subtropical climate is characterised by hot, humid summers, wet periods of heavy rainfall, and mild winters.

Although summers in Mackay are not as hot as those in northern regions like Townsville and Cairns, daily temperatures still average between 28-30 degrees. Combined with high humidity levels (70-80%), indoor spaces in the home will feel stuffy without adequate ventilation.

In line with global sustainability concerns, energy-efficient home designs are becoming the new standard for building a home that feels both comfortably cool in summer and pleasantly warm in winter. If you are planning to build your home in Mackay, here’s what you need to know about the importance of energy-efficient design.

NatHERS Requirements for New Mackay Homes

New homes in Mackay and across Queensland are required to meet the Nationwide House Energy Rating Scheme (NatHERS) requirements for energy efficiency. As of May 2024, new houses must have a minimum 7-star thermal rating under NatHERS.

New homes are assessed based on how much energy is required to maintain a comfortable living environment throughout the year. To achieve a 7-star thermal rating, homes must be built with the local climate in mind to ensure efficient heating, cooling, and ventilation.

In Mackay, home builders consider design elements such as the home’s layout, building orientation, lighting, insulation, and airflow between spaces to ensure that the 7-star rating is met.

Energy-Efficient Home Designs for Mackay’s Climate

Building layout 

Home designs with narrow spaces and hallways improve air flow, which helps control the indoor climate in Mackay’s hot and humid weather. Narrow hallways are particularly effective at improving indoor ventilation when the doorways and windows are aligned to create channels for air to flow through the home.

Building orientation 

Homes in Mackay should be oriented to the north to maximise sunlight exposure, for solar power systems, while preventing excessive heat gain from low-angle sunlight during sunrise to 9am and 3pm to sunset. The eastern and western sides of the home should be equipped with blinds or shaded by natural barriers, such as trees, to help the house stay cool. 

Ventilated roof space 

Houses in Mackay get hot in summer - when hot air gets into the roof, it gets trapped and heats up the rest of the house. To address this, builders create a cavity in the roof to create stack ventilation where cooler air enters and pushes out hot air. 

Construction materials

Temperatures in Mackay range from 15°C to 30°C - it can get a lot warmer, but it doesn’t get that cold during winter. To moderate the internal temperature of the house, builders use a combination of high thermal mass and lightweight materials. High thermal mass materials like concrete and masonry block retain heat in winter, and lightweight materials like timber and steel release heat for cooler nights. 

Insulation

Reflective foil insulation is used in Mackay homes to stop heat transfer from the roof to the rest of the house. Using lighter colours on the outside of the house and the roof also reduces heat absorption, keeping the inside of the house cooler.

Ceiling fans and air conditioning

With how warm it can get in the region, ceiling fans and air conditioning are non-negotiable for homes in Mackay. You’ll find that local builders list air conditioning as standard inclusions for new home builds in Mackay. 

Solar power systems

Mackay enjoys over 300 days of sunshine each year, making solar power a practical choice for homes in the region. Typically, installing solar power occurs after a home has been built, but it’s wise to consider it early on so that builders can plan accordingly by integrating the necessary infrastructure, such as wiring and roof space. Solar power generation can significantly reduce a home's energy costs and provide ongoing savings in the long run.

Mackay’s sunny, coastal climate makes it an idyllic location for new residents - with the right builder, your future home in Mackay can easily meet the 7-star energy rating and offer a comfortable living environment for you and your family. As the leading builder of quality homes in Mackay, Cougar Homes has a wide selection of energy-efficient home designs that cater to different lifestyle preferences and budgets. Get in touch with us today to start building your Mackay home.